Ok this is slightly a common problem i come across this situation quite easily, don't worry that the problem is with your usb adapter, its that the keyboard or acer does not have the software needed to run it properly if the keyboard came with a cd get a external cd player and download the software to the computer, but if it did not come with a cd *note: i assumed you have windows xp if you do not please find a way to do this with a different OS* go to control panel, add hardware then follow the instuctions there that should help you install the keyboard so you can use it, allthough if your keyboard is so old it has a ps/2 port i sugest getting a new keyboard with usb plug and use/play they are more user freindly and you will never have this type of problem again.

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First step is connect an external keyboard in USB port. Click start button, type "keyboard" in "search programs and files", in control panel, click "keyboard". In keyboard properties,, click Hardware tab, click properties button. click the driver tab in Standard 101/102-key or Microsoft Natural PS.......Check the button the if keyboard is Enabled. Or you can update keyboard driver through internet or in your original Acer CD Driver software.

There are 4 possible ways in my awareness...
Method 1: Resynchronize your device with the receiver To resynchronize the mouse or the keyboard with the receiver, follow
these steps.
Note When you synchronize the mouse or the keyboard with the
receiver, put the device near the receiver and put any other wireless keyboards and
mouse at least 6 feet away.

Press the button on the receiver, and then verify that the
light on the receiver starts to blink.

Note
Some newer Microsoft devices are permanently bound to their receiver
and cannot be reset. If your device does not have a button, skip to
Method 2.

If a dialog box appears on the screen in several seconds,
follow the instructions that appear on the screen. Otherwise, go to
the next step.

Press and release the Connect Channel button on the bottom
of the mouse or the keyboard.

Check the green light on the receiver. A steady green light
means the synchronization was successful. If the problem persists, try steps 1
through 4 again.

For the Wireless Notebook mouse:
This issue can occur if the micro-switch on the bottom of the mouse is
not released. Use a pin or a pen to try to release the button if it is
depressed.

The following example shows the buttons to push to synchronize a wireless hardware device:

Receiver
Bottom of the mouse: The connect channel button
Different kind of receiver
Collapse this imageExpand this imageCollapse this imageExpand this imageCollapse this imageExpand this image
Method 2: Try different portsTo determine
whether the problem is related to the ports on the computer, use only the two
cables that are included with the wireless desktop receiver, or the single
cable that is included with a mouse.
USB keyboard and USB mouseIf the USB cable is currently connected to a USB hub, disconnect
the device from the hub, and then connect it to a USB port on the computer. If
your device is already connected to a USB port on the computer, try to connect
the device to a different USB port if one is available.

Note Only one USB connection to the computer is required, even if
your device has two USB plugs. If the problem persists, disconnect other USB
devices and connect only the USB plug from the receiver to a USB port on the computer.
PS/2 devices
Warning If you have to change a PS/2 connection, shut off the
computer, make the changes, and then restart the computer. Do not plug a PS/2
device into the PS/2 port while the computer is running.If your devices are connected to PS/2 ports on the computer,
verify that you have the following configurations:

Verify that the USB plug for your mouse is connected to the
green USB-to-PS/2 adapter and that this adapter is plugged in the mouse PS/2
port on the computer. The mouse PS/2 port on the computer may also be green.
If you are not sure which PS/2 port is the mouse PS/2 port, see the
documentation that was included with the computer.

Verify that the USB plug for the keyboard is connected to
the purple USB-to-PS/2 adapter and that this adapter is plugged in the keyboard
PS/2 port on the computer. The keyboard PS/2 port on the computer may also be
purple. If you are not sure which PS/2 port is the keyboard PS/2 port, see the
documentation that was included with the computer.

If
you have to change your configuration, shut down the computer, make the
changes, and then restart the computer. If your mouse or keyboard has
both USB and PS/2 connections, try using the other connection.
PS/2 keyboard and USB mouseIf
you are using a wireless mouse with a USB connector and a PS/2
keyboard, verify that the USB mouse is plugged in a USB port on the
computer and that the purple keyboard PS/2 plug is connected to the
purple PS/2 port on the computer. If you have to change the PS/2
connection, shut off the computer, make the changes, and then restart
the computer.
Method 3: Reinsert the batteries or install fresh batteriesBoth
the wireless keyboard and the wireless mouse rely on AA alkaline
batteries for power. Remove the batteries, and then insert them again.
If the problem persists, install a fresh set of batteries in the device
that you are having problems with.
Method 4: Check for interferenceItems
such as wireless routers, radios, cell phones, desktop fans,
fluorescent lights, and large metal objects like computer cases and
metal furniture may interfere with the signal of the keyboard. Try to
keep such items away from the keyboard, and check the behavior of the
keyboard.

Do not put the mouse or the receiver near any
electrical devices, especially transmitters such as cordless or
cellular telephones or other wireless mouse devices or receivers. A
distance of at least 8 to 12 inches is recommended. Do not put the
mouse or the receiver on metallic surfaces or objects, especially long
metallic rails or cables. We recommend that you keep the mouse and the
keyboard a minimum of 3 feet from metallic objects.

attached a USB or PS/2 keyboard with your laptop and goto control panel and double click on add or remove software select the software which you can installed & delete it. Actually this fault reason virus or otherwise reinstall your operating system.

Just fill in the drop-downs and press "Go", it should show you a link the the exact driver you need to install. Once it's been installed you can set up your favorites with the software that it installs.

try one of the method below:
Method 1: Try different ports
loadTOCNode(2, 'moreinformation');
Warning If you have to change a PS/2 connection, shut off the computer, make the changes, and then restart the computer. Do not plug a PS/2 device in the PS/2 port while the computer is running.

To determine whether the problem is related to the ports on the computer, use only the two cables that are included with the wireless desktop receiver, or the single cable that is included with a mouse.
USB keyboard and USB mouse
loadTOCNode(3, 'moreinformation');
If the USB cable is currently connected to a USB hub, disconnect the device from the hub, and then connect it to a USB port on the computer. If your device is already connected to a USB port on the computer, try to connect the device to a different USB port if one is available.

Note Only one USB connection to the computer is required, even if your device has two USB plugs. If the problem persists, disconnect other USB devices and connect only the USB plug from the receiver to a USB port on the computer.
PS/2 devices
loadTOCNode(3, 'moreinformation');
If your devices are connected to PS/2 ports on the computer, verify that you have the following configurations:
•
Verify that the USB plug for your mouse is connected to the green USB-to-PS/2 adapter and that this adapter is plugged in the mouse PS/2 port on the computer. The mouse PS/2 port on the computer may also be green. If you are not sure which PS/2 port is the mouse PS/2 port, see the documentation that came with the computer.
•
Verify that the USB plug for the keyboard is connected to the purple USB-to-PS/2 adapter and that this adapter is plugged in the keyboard PS/2 port on the computer. The keyboard PS/2 port on the computer may also be purple. If you are not sure which PS/2 port is the keyboard PS/2 port, see the documentation that came with the computer.If you have to change your configuration, shut off the computer, make the changes, and then restart the computer. If your mouse or keyboard has both USB and PS/2 connections, try using the other connection.
PS/2 keyboard and USB mouse
loadTOCNode(3, 'moreinformation');
Verify that the USB mouse is plugged in a USB port on the computer and that the purple keyboard PS/2 plug is connected to the purple PS/2 port on the computer. If you have to change the PS/2 connection, shut off the computer, make the changes, and then restart the computer. Back to the top
Method 2: Install fresh batteries
loadTOCNode(2, 'moreinformation');
Both the wireless keyboard and the wireless mouse rely on AA alkaline batteries for power. If the problem persists, install a fresh set of batteries in the device that you are experiencing problems with. Back to the top
Method 3: Resynchronize your device to the receiver
loadTOCNode(2, 'moreinformation');
To resynchronize the mouse or keyboard to the receiver, follow these steps.

Note When you synchronize the mouse or the keyboard with the receiver, put the device near the receiver and put other wireless keyboards and mouse more than six feet away.
1.
Press the button on the receiver, and then verify that the light on the receiver starts to blink.
2.
If a dialog box appears on the screen in several seconds, follow the instructions that appear on the screen.

Otherwise, go to the next step.
3.
Press and release the Connect Channel button on the bottom of your mouse or keyboard.
4.
Check the green light on the receiver. A steady green light means the synchronization was successful. If the problem persists, try steps 1 through 4 again.Back to the top
Method 4: Install the latest software
loadTOCNode(2, 'moreinformation');
If you are troubleshooting a wireless mouse, download and install the latest Microsoft IntelliPoint software. For more information about IntelliPoint software, visit the following Microsoft Web site: http://www.microsoft.com/hardware/mouseandkeyboard/Download.mspx (http://www.microsoft.com/hardware/mouseandkeyboard/Download.mspx)
If you are troubleshooting a wireless keyboard, download and install the latest Microsoft IntelliType software. For more information about IntelliType software, visit the following Microsoft Web site: http://www.microsoft.com/hardware/mouseandkeyboard/Download.mspx (http://www.microsoft.com/hardware/mouseandkeyboard/Download.mspx)Back to the top
Method 5: Clean the mouse lens
loadTOCNode(2, 'moreinformation');
This problem may occur if you are using an optical or laser mouse and the lens on the mouse is dirty. To clean the lens of an optical or laser mouse, follow these steps:
1.
Use a dry cloth to clean the bottom surface of the mouse.
2.
Check to see whether the mouse functions correctly.
3.
If you see dust on the bottom of the mouse, use a can of pressurized de-ionized air to blow away the dust on the lens.
4.
Check to see whether the mouse functions correctly.
5.
If the pressurized air canister is not available, blow dry air on the lenses by using your mouth one or two times.
6.
Check to see whether the mouse functions correctly.
7.
If these steps do not resolve the problem, use a cotton bud to clean the lens without scratching it.